Criminal that mainly in court could be uncollaborative (5,3)
I believe the answer is:
above all
I'm afraid I can't explain this answer.
Can you help me to learn more?
(Other definitions for above all that I've seen before include "Shakespeare: 'This . . . . . . . ., to thine own self be true'" , "Supremely" , "Especially" , "Mainly" , "Like the managing director" .)